Question

3. The figure shows a charge +q and another charge -q fixed at points A and B separated by a distance of 10.0 cm. If q = 2 µC, calculate a. The electric potential at point P
b. The electric potential at point Q
c. The work done to bring a charge of 5 µC from P to Q.

Answer 1

We calculate potential at point Q is given by $V_1+V_2$

Which is basically the potential created by the first charge plus the potential created by second question

Here we are not given the from A and B to P and Q hence we will assume is as PA , PB and QA, QB respectively

Potential at point P = $\frac{q}{4\pi\epsilon_oPA}+\frac{-q}{4\pi\epsilon_oPB}$

Potential at point Q =$\frac{q}{4\pi\epsilon_oQA}+\frac{-q}{4\pi\epsilon_oQB}$